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Full text of "The manufacture and properties of iron and steel"

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' Many changes have been made in preparing the fourth edition. By constant additions the book had grown too big to be convenient, so that every line has been gone over to eliminate unnecessary phrases or words. The detailed calculations by the method of least squares in Chapter XVII has been omitted, and it has been deemed unnecessary to print the Standard Specifications' in full, since they are constantly subject to change. On the other hand, much new matter has been added; a new determination of the effect of certaia elements upon steel is given in Chapter XVII, and at a hundred places new knowledge has been interpolated as suggested by recent progress, or by friends, both here and abroad, who have volunteered information looking to the improvement of this book.
H. H. CAMPBELL. Bteelton, Pa., October, 1906,